Conduit construction



May 14, 1929.

Filed Dec. 22, 1926 &

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Patented May 14, 1929.

uui'rsu stares PATENT OFFICE.

lEl-JEORGLE llftALlill-l' MIEITCATJH, Jl'lt, O13 ERIE, lEElTt'lZlSYlLVALNIJ-t, AElfSTG'NOR TO ERIE MALIJE- ABLE IRON COMPANY" 01? ERIE, PENNSYLVANIA, A CORPORATION 01 Iilllll'NSYIr VANTA.

C(lNDUT'l-T CONSTRUCTION.

AppHeation filed. December 22, 1926. Serial No. 156,496.

in the leading ofl' coruluits through concrete :iloors it is quite common to use a conduit formed of fiber, or paper, stock, the real rnission of the conduit being merely to act as a term as the j ilastic material is laid. The present invention is designed to facilitate the connecting up of conduits ott this type with the ordinary metallic conduit which is car ried to the point oitv use. Features and details ot the invention will appear from the specification and claim.

The invention is illustrated in the accompanying drawings as follows z- Fi 1 shows a sectional view of the conduit connection as arranged in a floor.

Fig. 2 an elevation of the contracting sleeve of the fitting.

Fig. 3 a view of the fitting capped.

Fig. 4 a sectional View showing an alternative construction.

1 marks the plastic floor which has the floor level 1 The conduit 2 is put in place prior to the laying of this floor and a floor section of fitting 3 is secured to the conduit 2, the fitting having a socket 4 into which the conduit extends. The fitting has the clamp fingers 5 extending from its lower end terminating in cars 6 through which a clamping screw 7 extends. This clamp is of peculiar advantage in this construction because the liber, or paper conduit 2 varies quite Widely in diameter and the linger clainp has a wide clamping range.

The upper end of the floor section of the titling is screwtlneaded at 8, the upper end of this fitting terminating preferably ust below the door level. A supplemental section 9 is screwed on to the floor section and has a sleeved. extension 10. A. tapered contracting sleeve 11 is arranged in the extension and is adapted to receive a threadless conduit 12. The upper end of the sleeve is screw-threaded at 13 and a nut 14: operates on this upper end. and thus draws the sleeve into the extension contracting it and clamping it on the conduit 12 which ordinarily will be of the usual metallic type. The floor sec-ti on of the fitting is ordinarily secured to the conduit prior to the laying of the floor being brought to the proper floor level and it is desirable to close the conduct so as to prevent material entenng the conduit during the laying of the floor. To this end a cap 16 may be screwed on the floor section of the fitting, the upper face of this cap being at the floor level. The periphery of this cap is slightly tapered at 1'? so that it may be readily removed and the supplemental section has its periphery at18 slightly smaller than the periphery 17 so that when the cap is removed the supplemental section. of the fitting will readily enter the socket in the con crete lett by the cap. it is oluious that it dc sired the cap may be left temporarily in place at thefioor level until the floor conduit may be desired so that the cap serves the double function, acting as a part of the :lorin in finishing the conduit at the door level and in torining a cap if desired.

In order that the screwing to place of the cap or the upper section may not disturb the floor section it is desirable to form the floor section with ribs which seating in the concret-elock the floor section against turning. It willbe noted that with this construction the floor section being solidly set in the con crete forms a support which will retain the upwardly extending conduit 12 rigidly so that other support is not required. Heretotore it has been connnon to build up around the upstanding conduit a base of concrete for this purpose. This invention obviates the necessity of such construction.

In Fig. i the floor section is similar to that shown in Figs. 1 and 3. The supplemental section 19, however, has a screw thread 19 engaging the threads on the floor section and is internally screw-threaded at 20. A sleeve 21 having a screw-threaded end 22, a tapered intermediate portion 23, and a wrench-hold portion 2 1. is screwed into the section. It is provided. with a slot 25 so that as it is screwed in, the tapered. portion contracts this sleeve clan'iping it to the conduit. The floor section may be capped in this construction asin the preceding structure the section 19 having a tapered outer surface 526 corresponding to the surface 18. It will be noted that the supple mental sections illiilstrated in Figs. 1 and linvolve the manner of securing threadless conduit exemplified in the patents to Howard A. Selah, #1591486 and 51,606,188 respectively.

hat I claimv as new is tapered periphery with the larger end toward In a conduit construction the combination the floor surface, and a conduit secured to the of a floor formed of plastic material; a eonsupplemental section. duit in the body of the material; and a fitting In testimony whereof I have hereunto set comprising a floor section secured to the conmy hand.

duit below the floor level, a supplemental section secured to the floor section and having a GEORGE RALPH METCALF, Jiz. 

